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A process for extracting rare earth oxides from fluorescent powder waste

A rare earth oxide and rare earth hydroxide technology, applied in the direction of improving process efficiency, can solve the problems of affecting the process, low purity of rare earth oxides, low recovery rate of rare earth elements, etc., and achieve the effect of improving leaching rate

Active Publication Date: 2021-07-09
GANZHOU QICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the process of extracting and recovering rare earth elements such as europium and yttrium from phosphor waste is usually to directly roast the phosphor waste, then use acid solution to leach, then precipitate and remove impurities, and roast at high temperature to produce rare earth oxides. There are a lot of iron, silicon, and aluminum impurities, which will affect the subsequent process. There are also rare earth elements such as europium and yttrium, which have a low recovery rate, and the purity of the rare earth oxides produced by recycling is low.

Method used

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  • A process for extracting rare earth oxides from fluorescent powder waste
  • A process for extracting rare earth oxides from fluorescent powder waste
  • A process for extracting rare earth oxides from fluorescent powder waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1: According to the weight ratio between sodium carbonate and fluorescent powder waste of 1:1, add sodium carbonate to the phosphor waste, stir evenly and bake in the furnace at a temperature of 500 degrees Celsius;

[0028] S2: Add the oxidant hydrogen peroxide to the roasted solid of S1, the weight ratio between the added oxidant and phosphor waste is 0.4:1, the oxidation time is 4h, add hydrochloric acid for leaching after oxidation, and obtain a leachate, the added hydrochloric acid and phosphor waste The weight ratio between them is 1.5:2; add ammonia water dropwise to the hydrochloric acid leaching solution to adjust the pH to about 2, then adjust the pH to 4.5 with ammonium bicarbonate solution, age for 2 hours, and obtain the leaching solution after filtering off the precipitate;

[0029] S3: Filter the leachate, take the filtrate and add excess oxalic acid until no precipitation occurs in the filtrate, then filter to get the filter residue, add a strong alkali ...

Embodiment 2

[0035] S1: According to the weight ratio between sodium carbonate and fluorescent powder waste of 0.5:1, add sodium carbonate to the fluorescent powder waste, stir evenly, and bake in the furnace at a temperature of 450 degrees Celsius;

[0036] S2: Add the oxidant sodium hypochlorite to the roasted solid in S1, the weight ratio between the added oxidant and phosphor waste is 0.3:1, and the oxidation time is 2h. After oxidation, add hydrochloric acid for leaching to obtain a leachate. The weight ratio between them is 1.8:2; add ammonia water dropwise to the hydrochloric acid leaching solution to adjust the pH to about 2, then adjust the pH to 4 with ammonium bicarbonate solution, age for 1 hour, and obtain the leaching solution after filtering off the precipitate;

[0037] S3: Filter the leachate, take the filtrate and add excess oxalic acid until no precipitation occurs in the filtrate, then filter to get the filter residue, add a strong alkali solution with a concentration of...

Embodiment 3

[0043] S1: According to the weight ratio between sodium carbonate and fluorescent powder waste of 0.8:1, add sodium carbonate to the fluorescent powder waste, stir evenly, and bake in the furnace at a temperature of 550 degrees Celsius;

[0044] S2: Add an oxidizing agent to the roasted solid of S1, the weight ratio between the added oxidizing agent and phosphor waste is 0.5:1, the oxidizing agent is a mixture of hydrogen peroxide and sodium hypochlorite, the oxidation time is 5h, after oxidation, add hydrochloric acid for leaching to obtain a leaching solution, add The weight ratio between hydrochloric acid and fluorescent powder waste is 2:2; add ammonia water dropwise to the hydrochloric acid leaching solution to adjust the pH to about 2, then use ammonium bicarbonate solution to adjust the pH to 5, age for 3 hours, and filter out the precipitate to obtain Leachate;

[0045] S3: Filter the leachate, take the filtrate and add excess oxalic acid until no precipitation occurs ...

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Abstract

The invention discloses a process method for extracting rare earth oxides from fluorescent powder waste, which belongs to the field of fluorescent powder waste recycling. Fluorescence is carried out by using reagents such as sodium carbonate, hydrochloric acid, oxidant, ammonia water, ammonium bicarbonate, oxalic acid, and strong alkali solution. Powder waste roasting recovery process. The invention discloses a process method for extracting rare earth oxides from fluorescent powder waste, which can greatly reduce the content of iron, silicon and aluminum impurities in the hydrochloric acid leach solution, and can effectively improve the recovery rate of rare earth elements such as europium and yttrium in the fluorescent powder waste. And it can improve the purity of rare earth oxides recovered and produced.

Description

technical field [0001] The invention relates to the field of phosphor waste recycling, in particular to a process for extracting rare earth oxides from phosphor waste. Background technique [0002] At present, our country is in the stage of rapid development of science and technology, the innovation of production technology is fast, and the replacement of products is also fast. Due to factors of production and use, domestic phosphor waste reaches hundreds of thousands of tons every year, and phosphor waste contains a lot of rare earth elements. , has great recycling value. [0003] At present, the process of extracting and recovering rare earth elements such as europium and yttrium from phosphor waste is usually to directly roast the phosphor waste, then use acid solution to leach, then precipitate and remove impurities, and roast at high temperature to produce rare earth oxides. There are a lot of iron, silicon, and aluminum impurities, which will affect the subsequent pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/001C22B7/007C22B59/00Y02P10/20
Inventor 张国翔
Owner GANZHOU QICHANG NEW MATERIAL CO LTD